Re: Examples of current platforms/architectures where sizeof(void) > sizeof(int) ?

From	Bart <bc@freeuk.com>
Newsgroups	comp.lang.c
Subject	Re: Examples of current platforms/architectures where sizeof(void) > sizeof(int) ?
Date	2021-09-02 01:29 +0100
Organization	A noiseless patient Spider
Message-ID	<sgp5t4$pvm$1@dont-email.me> (permalink)
References	(4 earlier) <u2NXI.17687$F26.16281@fx44.iad> <sgocps$nqd$1@dont-email.me> <sgoe5r$2rv$1@dont-email.me> <sgokl2$h9j$1@dont-email.me> <zeRXI.35212$jl2.14440@fx34.iad>

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On 01/09/2021 21:18, Scott Lurndal wrote:
> Bart <bc@freeuk.com> writes:
>> On 01/09/2021 18:44, David Brown wrote:
> 
>>> I don't know what you mean by "not many".  In terms of numbers of units,
>>> 8-bit devices and "hidden" microcontrollers and DSPs outsell 32-bit
>>> devices by orders of magnitude - and 32-bit devices similarly outsell PC
>>> processors.  In terms of numbers of designs or chips available, it's the
>>> same story.  PC processors lead in terms of total cost, and lead hugely
>>> in terms of the number of different people programming on them.
>>
>> So, you want a programming language still extensively used for
>> conventional 64-bit computer chips (eg. the x64s and ARMs) to have its
>> design dictated by (or even crippled by) the limitations of a 4-bit
>> microcontroller used in some toaster?
> 
> The design of C, and the standards predate 64-bit computer chips
> by some time.
> 
>>
>> It's likely anyway that that 4-bit C compiler will be implementing a
>> rather specific dialect of C, without worrying too much about how well
>> it might work on 64-bit machines.
> 
> Actually, the typical C programmer wants his program to run on
> any system that supports the standard regardless of the underlying
> hardware.  The vast majority of C programmers don't even care what
> the underlying hardware is.

I appreciate that. I'd been writing stuff on x86-only for decades until 
about 2012 when I tried to port one of my interpreters to the RPi1, by 
generating intermediate C code, and it worked almost first time.

I was very impressed.

However when I posted that code here, it was torn to be pieces. 
Apparently it was full of UB, or potential UB, and some of the reasons 
were that C couldn't guarantee defined behaviour on every possible 
target, even though it would have been fine on the hardware it was going 
to work on.

(Another issue was gcc thinking I was doing misaligned accesses, when I 
wasn't, and substituting byte-at-a-time code.)

Now I've find a way around that: don't post C code on these forums and 
it'll generally be fine.

Thread

Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Lynn McGuire <lynnmcguire5@gmail.com> - 2021-08-30 21:59 -0500
  Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2021-08-30 21:53 -0700
    Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2021-08-30 21:59 -0700
  Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bo Persson <bo@bo-persson.se> - 2021-08-31 09:01 +0200
    Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Lynn McGuire <lynnmcguire5@gmail.com> - 2021-08-31 23:46 -0500
      Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? David Brown <david.brown@hesbynett.no> - 2021-09-01 08:19 +0200
      Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? scott@slp53.sl.home (Scott Lurndal) - 2021-09-01 15:32 +0000
        Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-01 19:20 +0200
          Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? David Brown <david.brown@hesbynett.no> - 2021-09-01 19:44 +0200
            Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Lynn McGuire <lynnmcguire5@gmail.com> - 2021-09-01 13:17 -0500
              Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? David Brown <david.brown@hesbynett.no> - 2021-09-01 20:32 +0200
              Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? scott@slp53.sl.home (Scott Lurndal) - 2021-09-01 19:00 +0000
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Lynn McGuire <lynnmcguire5@gmail.com> - 2021-09-01 15:06 -0500
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? scott@slp53.sl.home (Scott Lurndal) - 2021-09-01 20:14 +0000
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Michael S <already5chosen@yahoo.com> - 2021-09-01 14:04 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? scott@slp53.sl.home (Scott Lurndal) - 2021-09-01 23:44 +0000
            Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-01 20:37 +0200
              Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-01 12:43 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-02 05:37 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-02 11:28 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-03 07:10 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-03 06:59 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-03 17:02 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Manfred <noname@add.invalid> - 2021-09-03 19:33 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-03 19:47 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? scott@slp53.sl.home (Scott Lurndal) - 2021-09-03 17:54 +0000
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bart <bc@freeuk.com> - 2021-09-03 20:54 +0100
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? scott@slp53.sl.home (Scott Lurndal) - 2021-09-03 20:52 +0000
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-04 12:36 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-03 10:49 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-09-03 19:10 +0100
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-09-03 14:20 -0400
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-09-03 19:45 +0100
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-09-03 16:35 -0400
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? David Brown <david.brown@hesbynett.no> - 2021-09-04 13:12 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-04 09:11 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-04 11:27 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-05 04:25 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-06 16:10 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-08 19:44 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-08 11:45 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-09 19:09 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-09 10:51 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-10 10:31 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-10 10:41 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bonita Montero <Bonita.Montero@gmail.com> - 2021-09-14 04:14 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-14 07:45 -0700
            Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bart <bc@freeuk.com> - 2021-09-01 20:34 +0100
              Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-09-01 13:02 -0700
              Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? scott@slp53.sl.home (Scott Lurndal) - 2021-09-01 20:18 +0000
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Michael S <already5chosen@yahoo.com> - 2021-09-01 14:07 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bart <bc@freeuk.com> - 2021-09-01 22:18 +0100
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2021-09-01 18:23 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? David Brown <david.brown@hesbynett.no> - 2021-09-02 13:35 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2021-09-02 05:24 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2021-09-02 14:56 -0600
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Vir Campestris <vir.campestris@invalid.invalid> - 2021-09-07 21:12 +0100
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-09-07 22:19 -0400
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Vir Campestris <vir.campestris@invalid.invalid> - 2021-09-12 21:23 +0100
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Michael S <already5chosen@yahoo.com> - 2021-09-09 08:36 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Lynn McGuire <lynnmcguire5@gmail.com> - 2021-09-01 17:46 -0500
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-01 16:53 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Lynn McGuire <lynnmcguire5@gmail.com> - 2021-09-02 17:11 -0500
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-09-01 16:59 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-09-01 17:01 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bart <bc@freeuk.com> - 2021-09-02 01:29 +0100
              Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? David Brown <david.brown@hesbynett.no> - 2021-09-02 13:29 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bart <bc@freeuk.com> - 2021-09-02 14:19 +0100
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-09-02 17:10 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Michael S <already5chosen@yahoo.com> - 2021-09-02 07:28 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? David Brown <david.brown@hesbynett.no> - 2021-09-02 21:07 +0200
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Michael S <already5chosen@yahoo.com> - 2021-09-02 13:05 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-09-02 17:18 -0700
                Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Bart <bc@freeuk.com> - 2021-09-03 01:25 +0100
  Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Mark Bluemel <mark.bluemel@gmail.com> - 2021-09-01 03:30 -0700
    Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Mark Bluemel <mark.bluemel@gmail.com> - 2021-09-01 03:36 -0700
    Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Lynn McGuire <lynnmcguire5@gmail.com> - 2021-09-01 12:49 -0500
      Re: Examples of current platforms/architectures where sizeof(void*) > sizeof(int*) ? Mark Bluemel <mark.bluemel@gmail.com> - 2021-09-01 14:30 -0700

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